NDLI: The specificity loop of T7 RNA polymerase interacts first with the promoter and then with the elongating transcript, suggesting a mechanism for promoter clearance.

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The specificity loop of T7 RNA polymerase interacts first with the promoter and then with the elongating transcript, suggesting a mechanism for promoter clearance.

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The specificity loop of T7 RNA polymerase interacts first with the promoter and then with the elongating transcript, suggesting a mechanism for promoter clearance.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Temiakov, D. Mentesana, P. E. Ma, K. Mustaev, A. Mcallister, W. T. Borukhov, S.
Description	Author Affiliation: Temiakov D ( Morse Institute of Molecular Genetics, Department of Microbiology, State University of New York Health Science Center at Brooklyn, 450 Clarkson Avenue, Box 44, Brooklyn, NY 11203-2098, USA.);
Abstract	During the early stages of transcription, T7 RNA polymerase forms an unstable initiation complex that synthesizes and releases transcripts 2-8 nt in length before disengaging from the promoter and isomerizing to a stable elongation complex. In this study, we used RNA small middle dotprotein and RNA small middle dotDNA crosslinking methods to probe the location of newly synthesized RNA in halted elongation complexes. The results indicate that the RNA in an elongation complex remains in an RNA small middle dotDNA hybrid for about 8 nt from the site of nucleotide addition and emerges to the surface of the enzyme about 12 nt from the addition site. Strikingly, as the transcript leaves its hybrid with the template, the crosslinks it forms with the RNA polymerase involve a portion of a hairpin loop (the specificity loop) that makes specific contacts with the binding region of the promoter during initiation. This observation suggests that the specificity loop may have a dual role in transcription, binding first to the promoter and subsequently interacting with the RNA product. It seems likely that association of the nascent RNA with the specificity loop facilitates disengagement from the promoter and is an important part of the process that leads to a stable elongation complex.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	26
Volume Number	97
Language	English
Publisher	National Academy of Sciences
Publisher Date	2000-01-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Bacteriophage T7 Enzymology DNA-Directed RNA Polymerases Metabolism Promoter Regions, Genetic Binding Sites Cross-Linking Reagents Chemistry Models, Molecular Transcription, Genetic Viral Proteins Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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